Sunday, November19, 2017 L-36.com


Marine Weather and Tides
Galveston, TX

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:46AMSunset 5:23PM Sunday November 19, 2017 9:47 PM CST (03:47 UTC) Moonrise 7:36AMMoonset 6:34PM Illumination 2% Phase: Waxing Crescent; Moon at 1 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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GMZ375 Waters From Freeport To The Matagorda Ship Channel From 20 To 60 Nm-waters From High Island To Freeport From 20 To 60 Nm- 927 Pm Cst Sun Nov 19 2017
.small craft should exercise caution this evening...
Rest of tonight..Northeast winds 10 to 15 knots. Seas 4 to 6 feet decreasing to 3 to 5 feet.
Monday..East winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers.
Monday night and Tuesday..Southeast winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers.
Tuesday night..East winds 15 to 20 knots becoming northeast after midnight. Seas 2 to 4 feet. A chance of showers.
Wednesday..North winds 15 to 20 knots. Seas 3 to 5 feet.
Wednesday night..North winds 15 to 20 knots. Seas 5 to 6 feet with occasional seas up to 7 feet.
Thursday..North winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 7 feet.
Thursday night..North winds 10 to 15 knots. Seas 2 to 3 feet.
Friday..Northeast winds 5 to 10 knots increasing to 10 to 15 knots in the afternoon. Seas 1 to 2 feet.
Friday night..Southeast winds 10 to 15 knots becoming south after midnight. Seas 2 to 3 feet.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 927 Pm Cst Sun Nov 19 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Northeast winds and seas will continue to diminish overnight. East to southeast winds will resume Monday and Tuesday as high pressure moves off to the east. The next cold front will push off the coast Tuesday night or early Wednesday morning. Behind the front, caution flags will likely be needed for strengthening north winds and building seas.

7 Day Forecast for Marine Location Near Galveston, TX
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location: 28.84, -94.35     debug


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 200144
afdhgx
area forecast discussion
national weather service houston galveston tx
744 pm cst Sun nov 19 2017

Update
With quiet weather, the forecast is on track - the only tweaks
needed this evening are to more seamlessly trend observational
trends in with the forecast. Goes-16 shows some high cirrus
streaming into the area to join contrails over the area as we are
downstream of a subtle upper shortwave trough. This isn't likely
to have an extremely significant impact on the sensible weather
beyond maybe keeping radiational cooling overnight from peak
efficiency, but it is somewhat interesting to compare the
character of these clouds with those over the southwestern gulf
and eastern great lakes mid-atlantic in the nighttime
microphysics rgb product.

Luchs

Prev discussion issued 528 pm cst Sun nov 19 2017
aviation...

vfr for the 20 00z tafs with lots of cirrus streaming across the area
overnight. Light N to NE winds tonight will shift around to the S and
se during the day tomorrow. 42
prev discussion... Issued 306 pm cst Sun nov 19 2017
near term [through tonight]...

since I cannot take my AWIPS workstation outside in the cool
crisp fall air to enjoy, i'm left writing my discussion looking
out the window at it. But at least I have a window to look out to
see some thin cirrus moving across the sky. Satellite imagery
shows this as well and water vapor imagery showing a weak short
wave trough enhancing the cloud cover. High pressure over texas
today will move east over the tennessee river valley tonight. Axis
of high pressure will still support calm winds tonight. Cirrus
may be an issue for the low temperature forecast but do not think
it will be that thick enough to make an impact. Look for
temperatures Monday morning in the upper 30s to low 40s for much
of the area.

Short term [Monday through Tuesday night]...

short range models are in pretty good agreement with some weak
return flow on Monday going into Tuesday. Rain chances increase
mainly in the gulf and just along the coast on Tuesday. Vorticity
from a trough now approaching the pacific NW should continue its
movement around the upper level ridge and reach texas late
Tuesday. A cold front will be moving into the area about the same
time so will keep some low end rain chances in the forecast. Best
chances of rain and higher rainfall totals should remain off the
gulf coast. The cold front should push off the coast by Wednesday
morning with high pressure building over the plains.

Long term [Wednesday through Sunday]...

surface high pressure should remain over the area in some shape
or fashion through the end of the week. This will allow for
temperatures to be about 5 degrees below normal for thanksgiving.

You can be thankful we will not have any record breaking high
temperatures that day or even record high minimum temperatures.

Temperatures then push maybe 5 degrees above normal for the
holiday weekend as upper level ridge begins to expand over the
desert SW and southern rockies causing 500mb height rises. Even
then, the NW flow aloft may help push a weak front through the
area next Sunday taking the edge off those slightly above normal
temperatures.

Overpeck
aviation [18z TAF issuance]...

vfr conditions expected. Breezy conditions will continue to
diminish through the afternoon. High pressure will then bring
light winds from the north tonight and northeast to east on
Monday.

40
marine...

the winds have steadily diminished this afternoon. This in turn
has led to subsiding seas as well. Expect the small craft advisory
that was in effect between 20 and 60 nm offshore of the coast to
end at 4:00 pm. With the surface high pressure ridge over north
texas expected to build into east and southeast texas, winds and
seas should continue to diminish. Onshore winds will return on
Monday. Still looks like a cold front will move off of the coast
late Tuesday. Caution or advisory conditions are possible behind
this front Tuesday night and Wednesday.

The low water advisory will continue through the remainder of
this afternoon. Water levels in some locations of galveston bay
were down to one foot below the predicted levels. With diminishing
winds, should see the water levels to begin returning to near
normal levels this evening.

40
fire weather...

elevated fire weather conditions will continue through the
remainder of this afternoon. Some locations have seen the relative
humidity values to drop to around 25 percent so far this
afternoon. However, wind speeds have dropped below 15 mph and many
of the driest locations were already below 10 mph. On Monday the
lowest relative humidity values should range from 35 to 40
generally north of the interstate 10 corridor. With easterly and
then southeasterly winds developing, the elevated fire weather
threat should diminish as the afternoon progresses.

40

Preliminary point temps pops
College station (cll) 65 42 67 51 74 0 0 0 10 10
houston (iah) 67 41 67 52 74 0 0 0 10 20
galveston (gls) 65 55 67 61 74 0 0 10 10 30

Hgx watches warnings advisories
Tx... None.

Gm... Small craft advisory until 9 pm cst this evening for the
following zones: waters from freeport to the matagorda ship
channel from 20 to 60 nm... Waters from high island to
freeport from 20 to 60 nm.

Discussion... 25


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KXIH 25 mi33 min ENE 13 61°F 34°F
42035 - GALVESTON 22NM East of Galveston, TX 27 mi58 min NNE 14 G 16 62°F 71°F2 ft1023.8 hPa (+1.1)37°F
GTOT2 40 mi48 min 60°F 70°F
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 41 mi48 min NNE 13 G 15 67°F1023.5 hPa (+0.9)
GRRT2 43 mi48 min 61°F 65°F1024.2 hPa (+1.1)
LUIT2 44 mi48 min 70°F
RLOT2 - 8770971 - Rollover Pass, TX 47 mi48 min NNE 7 G 8 58°F 63°F1024.3 hPa (+1.3)

Wind History for Galveston Pleasure Pier, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
High Island 179A (Apache Corp), LA25 mi53 minENE 1610.00 miFair61°F33°F36%1023.7 hPa

Wind History from XIH (wind in knots)
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Last 24hrNE30
G38
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------NE14NE11NE7
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1 day agoSW12SW14SW13SW14SW13SW16
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2 days agoS11S12S7
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SW10SW10SW8SW11SW10SW6SW11SW8SW12SW12

Tide / Current Tables for Galveston Pleasure Pier, Gulf Of Mexico, Texas (sub)
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Galveston Pleasure Pier
Click for Map
Sun -- 12:55 AM CST     1.93 feet High Tide
Sun -- 06:46 AM CST     Sunrise
Sun -- 07:38 AM CST     Moonrise
Sun -- 09:08 AM CST     0.01 feet Low Tide
Sun -- 04:41 PM CST     2.19 feet High Tide
Sun -- 05:22 PM CST     Sunset
Sun -- 06:35 PM CST     Moonset
Sun -- 10:06 PM CST     1.71 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.91.91.91.71.41.10.70.30.100.10.30.71.11.622.22.22.121.81.71.71.8

Tide / Current Tables for Galveston (Pleasure Pier), Texas
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Galveston (Pleasure Pier)
Click for Map
Sun -- 01:53 AM CST     1.56 feet High Tide
Sun -- 06:46 AM CST     Sunrise
Sun -- 07:38 AM CST     Moonrise
Sun -- 09:19 AM CST     -0.03 feet Low Tide
Sun -- 05:15 PM CST     2.21 feet High Tide
Sun -- 05:22 PM CST     Sunset
Sun -- 06:35 PM CST     Moonset
Sun -- 11:25 PM CST     1.46 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.51.51.61.51.31.10.70.40.1-000.20.611.41.82.12.22.221.81.71.51.5

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of SouthCentralPlains    EDIT
Geos

Wind Forecast for Houston/Galveston, TX (22,6,7,8)
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Ground Weather Radar Station Houston/Galveston, TX
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weather_mapweather_map weather_map

Gulf Stream Current


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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.